# Warm-Up - PowerPoint PPT Presentation

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Warm-Up. Complete the Statement : When parallel lines are cut by a transversal , Alternate Interior Angles are ___________ Same Side Interior Angles are__________ Corresponding Angles are__________. 4.1 Congruent Figures. 12/3. Learning Target.

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Warm-Up

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### Warm-Up

• Complete the Statement:

When parallel lines are cut by a transversal,

• Alternate Interior Angles are ___________

• Same Side Interior Angles are__________

• Corresponding Angles are__________

## 4.1 Congruent Figures

12/3

### Learning Target

I can identify the corresponding parts of congruent figures

### Vocabulary

Congruent Polygons – Have congruent corresponding parts (sides and angles)

### Notes

IMPORTANT: When naming congruent polygons, you must list the vertices in the same order.

ABCD ≅ EFGH

### Practice

• Name the congruent polygons and find the measures of the numbered angles.

### Practice

Do 2 and 3 on the 4-1 worksheet.

### Naming Congruent Parts

You need to be able to name congruent corresponding parts of congruent polygons…so you need to pay attention to the vertices in the name of the polygon

### Practice

Do 6 and 7 on the 4-1 worksheet.

### Deciding if figures are congruent

• If you can show that all corresponding sides and angles are congruent, then the figures will be congruent.

### Important to Remember

• Vertical Angles are congruent.

• If two angles of one triangle are congruent to two angles of another triangle, then the third angles are congruent.

### Practice

Is triangle GHJ congruent to triangle IHJ? Explain why.

### Practice

Is triangle RSQ congruent to triangle VTS? Explain why.

### Practice Together

#10 on the 4-1 worksheet.

### Recap

• Naming Congruent Polygons (1-3)

• Find missing values of congruent polygons(1-3)

• Name corresponding parts of congruent polygons(4-7)

• State whether 2 figures are congruent or not (8-9)

• Provide reasons in proofs